Hacked - Do not buy or store your debit card info on their site. Received no help.

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I used to buy quilting fabric from here. I made the mistake of storing my debit card info on this site. I have not purchased from them since February 2016. On Sunday, someone purchased $427 of drones that was charged to my debit card and was shipped to an address that is not mine, does not match my card address nor is in a state where any previous purchase I made was delivered. I contacted them multiple times on Monday morning via email - they have no phone number and all I received was an acknowledgement email. I now am out over $500 thanks to their lack of response and overdraft charges on my account. I have reached out to them multiple times for help with no response. Massdrop - if you read this - please contact me to fix this!